GASES. Gases. The physical state of gases is defined by several physical properties Volume Temperature Amount (commonly expressed as number of moles) Pressure p = f ( T , V , n ). THE Perfect Gas. The perfect gas. A gas that obeys the perfect gas equation
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p = f(T, V, n)
PV = nRT
For a fixed amount of gas (constant n) plot of the properties of a gas gives a surface
Since in an ideal gas,
It is expressed as the ratio of the measured molar volume and the molar volume of a perfect gas
* Please take note that the equations here assume 1 mole of the substance, hence the use of Vm. For proper calculations, use the standard and default equations.
Surface of possible states for a gas obeying the Van der Waal’s equation
Surface of possible states for an ideal gas